Multiple punch and die.



2 SHEETS-SHEET 1.

Patented Aug. 19, 1913.

Jill? l llllllii! llllllilll S. D. HARTOG.

MULTIPLE PUNCH AND DIE.

APPLICATION FILED AI R. 22, 1912.

a? [Fzaezziazv S. D. HARTOG.

MULTIPLE PUNCH AND DIE.

APPLICATION FILED APR. 22, 1912.

1,070,887, Patented Aug. 19, 1913.

2 BHEETBSHEBT 2.

| II II S'IBIEHBN DR HARTOG, OF ST. LOUIS, urssoum.

MULTIPLE PUNCH AND DIE.

Speculation of Letters Patent.

Patented Amg. 19,1913.

Application filed April 29, 1912: Serial No. 692,520.

To all'wk'om it may concemr Be it known that E, Smrmn: D. HARTOG, acitizen of the United States, and. residing at St. Louis, in the Stateof Missouri, have invented certain new and useful Improvements inMultiple Punches and Dies, of which the followin isa specification.

This invention re ates to punches and dies,

and more particularly to punches and dies of" the multiple type.

In. the rior art, more particularly where a multip e punch and die wasused for punching thin sheets such. as laminae for use in electricalmachinery, the die was made of a solid block of metal. It was necessaryto make this die of comparatively great depth so as to permitconsiderable grinding to compensate for wear. Difliculty was exeriencedin making such. a. die accurate, and it therefore required for itsmaking exceiptionally skilled mechanics. One of the di cultiesencountered was due to the fact that. in the hardening and tempering ofthese dies (having comparatively large bulk), great internal" Slll'fllDSwere set up during cooling, causing not only cracking but also warpingand deformation. It was therefore necessary to handle the die withextreme care to 'eep aneven temperature- In the use of solid or blockdies, especially where'thin material is operated upon, the die apertureis liable to become worn or bellsmouthed. This not only results in anenlargement of the punched hole and the formation of hurs, and thereforeinaccuracy ofthe work, but also results in the unchings becoming wedded,thereby throwin undue stresses on the punches. It is there ore necessaryto grind the die down until the bellmouthed part. is ground out, whichrequires excessive grindin at a great cost. Moreover when, a solidorblock die becomes broken or defective, even though this defect extendsonly to one die aperture, the whole die has to be discarded.

A multiple punch as now constructed, consists of a punch holdercomprising a solidblock intowhich the punches are set. The manufactureof such punches re uires care- 50 ful fitting in order that the punc esand the punch holder may be properly alined with respect to the dieapertures in the die. As the punches must be comparatively long topermit rinding, the d'iificulty of fitting is lncrease in view of thefact that a slight displacement or error (more especially one ofinclination) at the root of the punch, will causethis error to bemultiplied at the punch point. It is therefore often necessary, afterthe punches are set in the holder, to properl aline the punches.bystaking or bending t em over. This operation, however, does not onlyweaken the punehes,but posit-ions them at an acute angle to the dieinstead of normal thereto, thereby increasing she tendency of thepunches to bind in the One of the objects of this invention therefore isto construct a punch and die which can be made with a minimum ofskill'edlabor and expense, and in which the major portions consist of duplicateinterchangeable elements.

Another object is to construct a die in which the die face consists ofduplicate plates which are interchangeable so that the number of unlikeparts is reduced to a minimum. and whereby worn parts mayreadily bereplaced.

I Another object is to construct a multiple punch in which the severalpunches are accurately located with respect to the die in a very simplemanner, and in which this lo cation can be accomplished" by means. ofduplicate interchangeable members or elements.

Further objects will appear from the detail description taken inconnection with theaccompanying drawings in which:

Figure 1 is a plan view partly in section of a punch and die made inaccordance with this invention, Fig. 2 is a section on the line 22 Fig.1, Fig. 3- is a planview of the die, Fig. 4 is a section on the line 4-4Fig. 3,. Fig, 5 is a section on the line 5.5 Fig. 2,

showing the punch holder in full lines, and Fig. 6 is a section on theline 6-6 Figs. 2 and- 5.

The die comprises a die block or holder adapted to be placed in a punchpress. The die apertures are not however in this case formed, in the dieblock, but the die face con- -sists of a set of duplicate andinterchangeable punched aperture forming plates, each having adie-formed contour, and positioned by their contour in mutual engagementto form in mutual assembly a plurality of accurately spaced dieapertures. The thickness of these plates is small as compared with. theblock form of die, for a purpose hereinafter to be described. .Duplicateplates of the same form as the die plates are secured to the punchholder or block and these plates form together means for spacing andlocating the punches in proper cooperative relation with respect to thedie apertures.

Referring to the accompanying drawings, and more particularly to Figs. 1to 4 inclusive, 20 designates a die block or holder recessed as shown at21 and provided with apertures 22. These apertures are preferably madelarger than the punch and the die apertures proper hereinafterdescribed, the object being to leave only partitions 23 of suflicientstrength to support the die plates hereinafter to be described. The dieface consists of a plurality of aperture forming members or die plates24 constructed when assembled to form together a plurality of dieapertures. These die plates are made accurately to size, in a mannerhereinafter to be described, so that one will be the exact duplicate ofthe other, and so as to make an accurate fit with the recess 21. Theseplates are secured in assembled relation on the die block by means ofscrews 25 extending through the block and into the plates. These screwsare not however intended to locate the plates in position, but merely tohold or clamp them in assembled relation. The edges 26 of the recess 21are accurately cut so as to accurately engage and locate the ends of thedie plates, and these edges or shoulders 26 are undercut as shown at 26'in Fig. 4 so as to take care of any slight burs which may be formed onthe die plates. The holes in the die block for receiving the screws 26are made larger than the screws as shown in Fig. 4 so that the dieplates can accommodate and adjust themselves in matched and cooperativerelation. The screws are merely for the purpose of clamping the platesin assembled cooperative relation on the die block. The finished dieformed as described consists of a plurality of die plates each plate ofwhich forms parts of adjacent die apertures, and each of which islocated and held in position by the other and by the shoulders 26. Thesedie plates are duplicates and. perfectly interchangeable so that one mabe interchanged for any of the others. I any one of the die platesshould become dama ed or worn it can be replaced by another die platewithout requiring an entirely new die. Since the die consists of anumber of duplicate pieces each having exactly the same shape, themanufacture requires only the accurate making of duplicate pieces of oneshape and small thickness, instead of a block construction as in theprior art. Inaccuracies are thus not multiplied as is the case with asolid or block die. The cutting edges of the die plates can be madestraight and need not be beveled for clearance, since their depth issmall. The die can thus be ground down until entirely worn out withoutenlarging the die apertures.

The punch holder or block, generally indi cated at A, and shown indetail in Figs. 5 and 6, comprises a plate 27 apertured or slotted toreceive the punches 28 and formed with a recess 29 adapted to receivemolten metal. The punch receiving slots or apertures 22 correspond tothe apertures 22 in the die block and are made larger than the punchesas shown in Figs. 2 and 5 for a purpose hereinafter to be described. Theunder surface of this late is recessed like the die block as shown 1nFigs. 1, 2, 5 and 6, so as to form undercut shoulders 30. This recess isarranged to receive a plurality of plates 31 identical to the plates 24and secured to the holder in a similar manner by means of screws 35. Thescrew holes in the plates 31 are also made larger than the screws, sothat the plates will be positioned and alined by the shoulders 30 and byeach other. These plates form together a plurality of aperturesidentical to the die apertures and in exactly the same cooperativerelation therewith. These plates are arranged to accurately space andlocate the punches on the punch holder and with respect to the dieapertures in the die block. The slots or apertures 22 in the plate 27are made slightly larger than the punches so that these punches will belocated spaced and alined solely by the plates 31. The punches areclamped in position by means of screws 32 passing through a plate 33secured to the plate 27, and the screw holes in the plate 33 are alsomade larger than the screws, as sho'wn in Fig. 2, to allow the plates 31to adjust the punches. The parts of the punch holder are securedtogether by means of screws 36, and after the punches are in place therecess 29 is filled with babbitt through a hole 34. A stripper plate 37is supported on the punch holder by headed pins 38 encircled by springs39. The punches are thus located and positioned by the plates 31, andafter they are thus positioned, the screws and babbitt serve to firmlyhold them in located position on the holder.

The plates 24 and 31 must be duplicate and perfectly interchangeable.This requires very accurate workmanship, which would make their cost toogreat if made by hand or according to ordinary machine shop methods. Aspecial method has therefore been developed for producing these plates.This method will now be described. The method consists in forming theplates to finished size with master punch and die mechanism. In practicetwo sets of unches and dies are used. One set (roughing set) isconstructed to punch the plates to nearly finished size; the plates arethen punched to finished size with a second set (finishing set). It isfound that in accordance with this method the plates can be punched tothe required accurate size withOut requiring additional machining orfiling. Only a Single set of punches and dies are required since thepieces 24 and 31 are identical in shape and size. The extreme mechanicalaccuracy thus extends only to the sets of master punches and dies;thereafter the actual punching of the die plates does not involve highskill, but may be performed by common mechanics. The plates cantherefore be produced in quantities at a small cost.

The plates 24 and 31 formed as described above have adie-formed contourproviding a part of an aperture, and forming engaging and positioningedges whereby the plates may be positioned by one another in assembledrelation to form a plurality of apertures.

The punches are located and positioned in the punch holder by means ofthe plates 31, and these plates being of the same size as the die plates24, serve to accurately locate the punches in position and in correctoperative relation with respect to the die apertures in the die block.Since these plates are thin as compared with block constructions(whether solid or sectional) they can be made in the manner describedWith.- out requiring great mechanical skill except in .the making of themaster punches or dies for the plates. These plates are interchangeable,and thus one may be replaced without requiring the replacement of thewhole die or even its dismantling. The plates are small andcomparatively thin;

the required heating and cooling for hardening and tempering willtherefore not cause distortion and cracking as is the case with blockdies which are of comparatively great depth and large bulk. The punchespass entirely through the die apertures 6., the apertures formed by thedie plates 24), and since these die apertures are shallow, and theapertures 22 are large, no wadding of the punchings will take place.This invention therefore results in a punch and die having a low firstcost, a low maintenance, having the capacity of accurate duplication andindefinite reproduction.

In the claims the terms plate and punched plate are used ascontradistinguished from block constructions Whether solid or sectional.The expression punch receiving aperture as used in the claims is used inits broad sense so as to include and cover the die apertures formed bythe plates 2 on the die holder and which receive the punches inthe-process of punching, as well as the apertures formed by the plates31 on the punch holder and which receive and permanently position thepunches thereon.

It is obvious that various changes may be made in the details ofconstruction without departing from this invention, and it is thereforeto be understood that this invention is not to be limited to thespecific construction shown and described.

Having thus described the invention what is claimed is:

1. A multiple punch and die including a holder or block. and a pluralityof duplicate interchangeable punched aperture forming plates mounted onsaid holder or block, each plate having a die-formed contour to formedge locating means said plates being positioned on said holder or blockby their contour in mutual engagement to form in mutual assembly aplurality of accurately spaced punch-receiving apertures.

2. A multiple punch and die including a holder or block, and a pluralityof do.- plicate interchangeable punched a erture forming plates mountedon said ho der or block, each plate having a die-formed contourproviding aperture forming and spacing means, said plates beingpositioned on said holder or block by their contour in mutual engagementto form in mutual assembly a plurality of accurately spacedpunclrreceiving apertures.

3. A, multiple punch and die including a holder or block, and aplurality of punched aperture forming plates mounted on said holder orblock, each plate having a die-formed contour providing parts of twoadjacent punch-receiving apertures, said plates being positioned by oneanother in assembled relation to form in mutual assembly a plurality ofaccurately spaced punch-receiving apertures.

4. In a multiple punch and die, a punched plate having a die-formedcontour providing duplicate interchangeable aperture forming and edgelocating means, a plurality of such plates being adapted to form whenassembled in mutual engagement on a holder or block a plurality ofaccurately spaced punch receiving apertures.

5. A multiple die comprising a block, and a die face comprising aplurality of duplicate interchangeable punched aperture forming platesmounted on said block, each of said plates having a die-formed contourproviding edge locating means, said plates being positioned on saidblock by their contour in mutual engagement to form in mutual assembly aplurality of accurately spaced die apertures.

6. A multiple die comprising a block, and a die face comprising aplurality of duplicate interchangeable punched aperture forming platesmounted on said block, each of said plates having a die-formed contourproviding aperture forming and spacing means for a plurality of adjacentapertures, said plates being positioned on said block by their contourin mutual engage ment to formin' mutualassembly a pluholder, puncduplicate interchangeable rality of accurately spaced die apertures.

7. A multi le punch comprising a punch es supported on said holder, anda pluralit of mutually engaging members on said holder constructed toengage and position said punches thereon.

8. A multiple punch comprising a punch holder, a plurality of mutuallyengaging duplicated interchangeable members supported on "said holder,said members being positioned and located one by the other in assembledrelation to form a pluralityof apertures, and punches supported on saidholder and in said apertures and positioned by said members. v

9. A multiple punch comprising a punch holder, a plurality of mutuallyengagin lates supporte on said holder, saidplates ing positioned andlocated one by theother in assembled relation to form a plurality ofapertures, and punches supported on said holder and in. said aperturesand positioned by said plates.

10. A multiple punch comprisin a punch holder,- punches supported onsaid holder, and a plurality of mutually engaging duplicateinterchangeable plates on said holder constructed to engage and embrace'said' punches, said lates being positioned and located one b the otherin assembled-relation on said ho der.-

11. A multiple punch comprising a punch holder, punches supported onsaid and plates on said holder for spacing and engaging said unches andconstructed to locate said punc es on said holder, said plates beingpositioned by one another independent of 'sai punches. I

12.- A multiple punch comprisin a punch holder, punches su ported onsaid holder, and a plurality o duplicate interchange able punch locatinplates mounted on said holder and en aging and spacing said punches, oneor embracing an adjacent pair of punches.

' 13. A punch and die comprising a die block, a unch holder, a set ofmutually en gaging uplicate interchangeable aperture forming members onsaid die block forming together a plurality of die apertures, punches onsaid 'punch holder, and a set of mutually engaging duplicateinterchangeable members on said punch holder constructed to engage andposition said punches thereon. 14. A punch and die comprising a dieholder, i-'

said plates engaging and block, a punch holder having punches thereaengaging and locating said punch with respect to the aperture formed insaid die.

16. A punch and die comprising a die block, a punch holder, a pluralityof duplicate interchangeable aperture forming die plates secured to saidblock and forming together a plurality of die apertures,'a plu rality ofpunches supported by said holder, and a plurality of duplicateinterchangeable plates on said holder engaging and spacin said punchesand constructed to locate an position said punches with respect to saiddie apertures.

17. A multiple holder or block thereon, a plurality of duplicateinterunch and die including a changeable aperture forming plates on saidholder or block and positioned thereon by said shoulders, said platesbeing located one by the other in assembled relation to form a pluralityof apertures.

18. A multiple punch and die including a holder, a plurality ofduplicate interchangeable aperture forming plates on said holder, meansfor positioning said plates in mutual engagement on said holder, and

plurality of die apertures,

aving locating shoulders means I independent of said positioning 7 meansfor securing saidplates in assembled relation on said holder.

19. A multiple punch-and die including a holder or block havin undercutlocating shoulders thereon, a .p interchangeable aperture forming plateson said holder or block and positioned'thereon by said shoulders,'saidplates being located one 'by the other in assembled re ation to form aplurality of a ertures.

In te timon'y whereo I afilx my signature in presence of two'v'vitnesses.

STEPHEN D. HARTOG. Witnesses: V

J. H: BRUNINGA, FRANKLIN MILLER.

urality of duplicate

